*I need to know the angle subtended by an object that is on a 35mm
negative. It was taken with a 38mm lens and the focus was at
infinity. It is 2.7mm wide on the negative.
Here are my rough calculations. Can someone verify them or correct
them?
My calculations:
I calculate that a 38mm lens has a field of view of approximately 59
degrees (please check this).
If a 35mm negative is 24x36mm (or is it a little larger?), the
diagonal is 43.27mm. 43.27mm on the negative corresponds to 59
degrees in the field of view, so each mm ...*

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